I just connected my tv to the Internet via wireless

Is there a way to get the sound to go through my AV Receiver

There are probably a few ways depending on what sort of connections your sound card has. Do you know the type of sound card, or if it’s integrated to the motherboard do you know what type of motherboard. If not what type of computer is it.

You will likely have a SPDIF (optical or digital connection) and may have 5.1 or 7.1 analogue connections. You will also almost certainly have stereo left and right connections.

I use an optical cable for the tv to receiver connection.

^ Me too.

One more for the optical cable. If your TV has sound this may be the easiest option.

Yeah, if your tv has an optical audio out that could be used to connect to avr.